(3) Cluster is defined as two or more cases within a specific closed setting (eg. classroom, workplace, household, hospital, other residential institution), developing symptoms within the same two week period

! Baseline clotted blood sample should be taken asap and ideally no later than 7 days after symptom onset. Followup sample should be taken at least 14 days after the baseline sample, or 28 days after illness onset if a sample couldn’t be taken when case was symptomatic.

(*) Contact definitions (from date of illness onset in index case and throughout their symptomatic period):

Health and social care workers: worker who provided direct clinical or personal care or examination of a symptomatic case positive for novel coronavirus or within close vicinity of an aerosol generating procedure AND who were not wearing full personal protective equipment (PPE***) at the time.

Household or close contact: any person who has had prolonged face-to-face contact (>15 minutes) with a symptomatic case positive for novel coronavirus in a household or other closed setting.